Merge pull request #2283 from 545072985/master

#6 #882 第六次实验+报告

soft1614080902204/app/src/main/AndroidManifest.xml

@@ -2,6 +2,13 @@
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
     package="com.example.gwl20.soft1614080902204">
 
+    <uses-permission android:name="android.permission.INTERNET" />
+    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
+    <uses-permission android:name="android.permission.ACCESS_WIFI_STATE" />
+    <uses-permission android:name="android.permission.CHANGE_WIFI_STATE" />
+    <uses-permission android:name="android.permission.CHANGE_NETWORK_STATE" />
+    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
+
     <application
         android:allowBackup="true"
         android:icon="@mipmap/ic_launcher"
@@ -23,7 +30,7 @@
         <activity
             android:name=".soft1614080902204CActivity"
             android:label="@string/title_activity_soft1614080902204_c"
-            android:theme="@style/AppTheme.NoActionBar"></activity>
+            android:theme="@style/AppTheme.NoActionBar" />
     </application>
 
 </manifest>

soft1614080902204/app/src/main/java/com/example/gwl20/soft1614080902204/HttpThread.java

@@ -0,0 +1,70 @@
+package com.example.gwl20.soft1614080902204;
+
+import android.graphics.Bitmap;
+import android.graphics.BitmapFactory;
+import android.os.Environment;
+import android.os.Handler;
+import android.widget.ImageView;
+import android.content.Context;
+import android.os.Environment;
+
+
+import java.io.File;
+import java.io.FileOutputStream;
+import java.io.InputStream;
+import java.net.HttpURLConnection;
+import java.net.MalformedURLException;
+import java.net.URL;
+
+public class HttpThread extends Thread {
+    private String url;
+    private ImageView imageView;
+    private Handler handler;
+    public HttpThread(String url, ImageView imageView,Handler handler){
+        this.url=url;
+        this.imageView=imageView;
+        this.handler=handler;
+    }
+    @Override
+    public void run(){
+        try {
+            URL httpUrl=new URL(url);
+            HttpURLConnection conn=(HttpURLConnection)httpUrl.openConnection();
+            conn.setReadTimeout(5000);
+            conn.setRequestMethod("GET");
+            conn.setDoInput(true);
+            InputStream in=conn.getInputStream();
+            FileOutputStream out=null;
+            File downloadFile=null;
+            String fileName=String.valueOf(System.currentTimeMillis());
+            if(Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)){
+                File appDir=Environment.getExternalStorageDirectory();
+                downloadFile=new File(appDir,fileName);
+                out=new FileOutputStream(downloadFile);
+            }
+//            String storePath = Environment.getExternalStorageDirectory().getAbsolutePath() + File.separator + "demo";
+//            File appDir = new File(storePath);
+//            if (!appDir.exists()) {
+//                appDir.mkdir(); }
+//            downloadFile=new File(appDir,fileName);
+//            out=new FileOutputStream(downloadFile);
+
+            byte [] b=new byte[4*1024];
+            int len;
+            if(out!=null) {
+                while ((len = in.read(b)) != -1) {
+                    out.write(b,0,len);
+                }
+            }
+            final Bitmap bitmap= BitmapFactory.decodeFile(downloadFile.getAbsolutePath());
+            handler.post(new Runnable() {
+                @Override
+                public void run() {
+                    imageView.setImageBitmap(bitmap);
+                }
+            });
+        } catch (java.io.IOException e) {
+            e.printStackTrace();
+        }
+    }
+}

soft1614080902204/app/src/main/java/com/example/gwl20/soft1614080902204/soft1614080902204BActivity.java

@@ -2,14 +2,17 @@
 
 import android.content.Intent;
 import android.os.Bundle;
+import android.os.Handler;
 import android.support.design.widget.FloatingActionButton;
 import android.support.design.widget.Snackbar;
 import android.support.v7.app.AppCompatActivity;
 import android.support.v7.widget.Toolbar;
 import android.view.View;
 import android.widget.Button;
+import android.widget.ImageView;
 import android.widget.TextView;
 
+import java.io.File;
 import java.io.FileInputStream;
 import java.io.FileOutputStream;
 import java.text.SimpleDateFormat;
@@ -18,13 +21,16 @@
 public class soft1614080902204BActivity extends AppCompatActivity {
 
     private Button bu,jiandao,shitou;
+    private ImageView beijin;
+    private Handler handler=new Handler();
     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.activity_soft1614080902204_b);
         bu=(Button)findViewById(R.id.button_bu);
         jiandao=(Button)findViewById(R.id.button_jiandao);
         shitou=(Button)findViewById(R.id.button_shitou);
+        beijin=(ImageView)findViewById(R.id.imageView_beijin);
         bu.setOnClickListener(new View.OnClickListener() {
             @Override
             public void onClick(View v) {
@@ -49,7 +55,12 @@ public void onClick(View v) {
                 startActivityForResult(intent,1);
             }
         });
-
+        ((Button)findViewById(R.id.button_xiazai)).setOnClickListener(new View.OnClickListener() {
+            @Override
+            public void onClick(View v) {
+                new HttpThread("http://5b0988e595225.cdn.sohucs.com/images/20170904/d03b058017fc42568e4b595f40879ba1.jpeg",beijin,handler).start();
+            }
+        });
     }
     @Override
 

soft1614080902204/app/src/main/res/layout/activity_soft1614080902204_b.xml

@@ -14,18 +14,31 @@
         tools:layout_editor_absoluteY="0dp"
         android:background="#F5fffa">
         <ImageView
+            android:id="@+id/imageView_beijin"
             android:layout_width="match_parent"
             android:layout_height="250dp"
-            android:background="@drawable/timg"
-            />
-        <TextView
+            android:background="@drawable/timg"/>
+        <LinearLayout
             android:layout_width="match_parent"
             android:layout_height="wrap_content"
-            android:text="请选择要出的拳"
-            android:textColor="#636363"
-            android:textStyle="bold"
-            android:textSize="28sp"
-            android:background="#F5fffa"/>
+            android:orientation="horizontal">
+            <TextView
+                android:layout_width="wrap_content"
+                android:layout_height="wrap_content"
+                android:text="请选择要出的拳"
+                android:textColor="#636363"
+                android:textStyle="bold"
+                android:textSize="28sp"
+                android:background="#F5fffa"/>
+            <Button
+                android:id="@+id/button_xiazai"
+                android:layout_marginLeft="60dp"
+                android:layout_marginRight="20dp"
+                android:layout_width="match_parent"
+                android:layout_height="45dp"
+                android:text="下载背景"/>
+        </LinearLayout>
+
 
         <LinearLayout
             android:layout_width="match_parent"

soft1614080902204/app/src/main/res/values/strings.xml

@@ -2,4 +2,5 @@
     <string name="app_name">soft1614080902204</string>
     <string name="title_activity_soft1614080902204_b">soft1614080902204BActivity</string>
     <string name="title_activity_soft1614080902204_c">soft1614080902204CActivity</string>
+    <string name="title_activity_soft1614080902204_d">soft1614080902204DActivity</string>
 </resources>

soft1614080902204/report6.md

@@ -0,0 +1,37 @@
+# 第六次实验
+
+## 1.实验目标
+
+(1)掌握Android网络访问方法；
+
+(2)理解XML和JSON表示数据的方法。
+
+## 2.实验内容
+(1)从网络下载一个文件（图片、MP3、MP4）；
+
+(2)保存到手机，在应用中使用文件；
+
+(3)将应用运行结果截图。
+
+## 3.实验步骤
+（1）打开已建好的项目soft1614080902204
+
+（2）在新建一个下载线程.java文件httpThread.java，用来下载图片，新建一个下载Button用来触发下载线程；
+
+（3）在httpThread文件中用URL和HttpURLConnection来连接图片所在的网络地址获得图片数据的输入流
+
+（3）在本地创建一个文件并设置一个输出流用来保存图片数据，并用Bitmap形式保存图片并展示在ImageView中
+
+（4）用handler.post来刷新ui；
+
+（5）完成并运行成功
+
+（6）用git上交
+
+## 4.实验结果
+![实验截图](https://github.com/545072985/android-labs-2018/blob/master/soft1614080902204/sy6/tupian6.1.png)
+
+![实验结果](https://github.com/545072985/android-labs-2018/blob/master/soft1614080902204/sy6/tupian6.2.png) 
+
+## 5.实验体会
+这次实验让我学会了简用URL的相关用法来进行网络连接下载图片，并对文件创建和输入输出流有了更深一的理解。